Ermao might not be sure whether the poop was human's or a dog's, and even if it was from a dog, it wasn't necessarily from Black Gold. He was just guessing it might be Black Gold's.
But Zheng Tan was quite certain that it was indeed from Black Gold, yet he didn't understand why. Cats usually have this habit of burying their poop, especially the wild ones which tend to do it better. He had heard that this seemed to be an instinctive behavior of cats—except for himself.
About this behavior, people have many speculations, one of which is that as solitary hunters, cats try to hide their traces as much as possible. Even though they have been brought into human society now, they still retain their wild habits and instincts.
And as for dogs, which typically just do their business and leave, would they really take the trouble to bury their poop?
Could this have been one of Black Gold's past training exercises?
The trainer must have had a tough time during the training sessions.
